Improve configuration file parsing
The configuration file is now parsed with a simple awk program which is simpler to understand and maintain
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simple_backup
214
simple_backup
@ -15,7 +15,7 @@
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#You should have received a copy of the GNU General Public License
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#along with this program. If not, see <http://www.gnu.org/licenses/>.
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#Version 1.1
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#Version 1.2
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#Simple backup script. Reads options, sources and destination from a configuration file or standard input
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#Help function
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@ -74,156 +74,68 @@ function read_conf {
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fi
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while read line
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do
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#Ignore comments and empty lines
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if [[ $line == \#* || $line == "" ]]; then
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continue
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else
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#Get option name and values for the current line
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var=$(echo "$line" | cut -d"=" -f1)
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#Create temporary files
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INPUTS=$(mktemp)
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EXCLUDE=$(mktemp)
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BACKUP=$(mktemp)
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NKEEP=$(mktemp)
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case "$var" in
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#Files/folders to backup
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inputs)
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#Create a temporary file to store inputs
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INPUTS=$(mktemp)
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tmp=$(echo "$line" | cut -d"=" -f2)
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n=$(echo "$tmp" | awk -F ',' '{print NF}') #Files/folders must be separated with commas
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i=1
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#j=1
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n_in=0
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#Parse the configuration file
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awk -v INPUTS="$INPUTS" -v EXCLUDE="$EXCLUDE" -v BACKUP="$BACKUP" \
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-v NKEEP="$NKEEP" -v UHOME="$HOME/" -F '[=,]' \
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'$1=="inputs" { for ( i=2; i<=NF; i++ ) { sub(/^~\//,UHOME,$i); print $i > INPUTS } }
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$1=="backup_dir" { sub(/^~\//,UHOME,$2); print $2 > BACKUP }
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$1=="exclude" { for ( i=2; i<=NF; i++ ) { sub(/^~\//,UHOME,$i); print $i > EXCLUDE } }
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$1=="keep" { if ( $2 != NULL ) { print $2 > NKEEP } }' $CONFIG
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#Read each input and save it to the INPUTS file
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while [[ $i -le $n ]]
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do
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input=$(echo "$tmp" | cut -d"," -f$i)
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input=$(echo "$input" | tr -d \"\')
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BACKUP_DEV=$(cat $BACKUP)
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KEEP=$(cat $NKEEP)
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rm "$BACKUP"
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rm "$NKEEP"
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if [[ "$input" =~ ^~/ ]]; then
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input=$(echo ${input/\~/$HOME})
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fi
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if [[ -z "$BACKUP_DEV" || ! -d "$BACKUP_DEV" ]]; then
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#If the backup directory is not set or doesn't exist, exit
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echo "$(date): Backup failed (see errors.log)" >> $HOME/.simple_backup/simple_backup.log
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echo "Error: Output folder \"$BACKUP_DEV\" not found" | tee -a $HOME/.simple_backup/errors.log
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#If libnotify is installed, show desktop notification that backup failed
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! command -v notify-send > /dev/null 2>&1 || DISPLAY=:0.0 notify-send -u low -t 10000 "Backup failed"
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if [[ ! -e "$input" ]]; then
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#Warn the user if an input doesn't exist
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echo "Warning: input \"$input\" not found. Skipping" | tee -a $HOME/.simple_backup/warning.log
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else
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n_in=$((n_in+1))
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fi
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echo "$input" >> $INPUTS
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i=$((i+1))
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done
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;;
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#Directory where the backup is saved
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backup_dir)
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BACKUP_DEV=$(echo "$line" | cut -d"=" -f2)
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BACKUP_DEV=$(echo "$BACKUP_DEV" | tr -d \"\')
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if [[ "$BACKUP_DEV" =~ ^~/ ]]; then
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BACKUP_DEV=$(echo ${BACKUP_DEV/\~/$HOME})
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fi
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if [[ -z "$BACKUP_DEV" ]]; then
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#If the backup directory is not set, exit
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echo "$(date): Backup failed (see errors.log)" >> $HOME/.simple_backup/simple_backup.log
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echo "Error: No backup folder set in configuration file" | tee -a $HOME/.simple_backup/errors.log
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#If libnotify is installed, show desktop notification that backup failed
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! command -v notify-send > /dev/null 2>&1 || DISPLAY=:0.0 notify-send -u low -t 10000 "Backup failed"
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if [[ -f $HOME/.simple_backup/simple_backup.log.old ]]; then
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rm -f $HOME/.simple_backup/simple_backup.log.old
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fi
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if [[ -f $HOME/.simple_backup/errors.log.old ]]; then
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rm -f $HOME/.simple_backup/errors.log.old
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fi
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if [[ -f $HOME/.simple_backup/warnings.log.old ]]; then
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rm -f $HOME/.simple_backup/warnings.log.old
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fi
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exit 1
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fi
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if [[ ! -d "$BACKUP_DEV" ]]; then
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#If the backup directory doesn't exist, exit
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echo "$(date): Backup failed (see errors.log)" >> $HOME/.simple_backup/simple_backup.log
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echo "Error: Output folder \"$BACKUP_DEV\" not found" | tee -a $HOME/.simple_backup/errors.log
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#If libnotify is installed, show desktop notification that backup failed
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! command -v notify-send > /dev/null 2>&1 || DISPLAY=:0.0 notify-send -u low -t 10000 "Backup failed"
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if [[ -f $HOME/.simple_backup/simple_backup.log.old ]]; then
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rm -f $HOME/.simple_backup/simple_backup.log.old
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fi
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if [[ -f $HOME/.simple_backup/errors.log.old ]]; then
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rm -f $HOME/.simple_backup/errors.log.old
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fi
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if [[ -f $HOME/.simple_backup/warnings.log.old ]]; then
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rm -f $HOME/.simple_backup/warnings.log.old
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fi
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exit 1
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fi
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BACKUP_DIR=$BACKUP_DEV/simple_backup
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DATE=$(date +%Y-%m-%d-%H:%M)
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#Create the backup subdirectory using date
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if [[ ! -d "$BACKUP_DIR" ]]; then
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mkdir -p "$BACKUP_DIR/$DATE"
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else
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#If previous backup(s) exist(s), save link to the last backup
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LAST_BACKUP=$(readlink -f "$BACKUP_DIR/last_backup")
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mkdir "$BACKUP_DIR/$DATE"
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fi
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#Set the backup directory variable to the newly created subfolder
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BACKUP_DIR="$BACKUP_DIR/$DATE"
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;;
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#Files/directories/patterns to exclude from backup
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exclude)
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#Create temp file to store exclude patterns
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EXCLUDE=$(mktemp)
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temp=$(echo "$line" | cut -d"=" -f2)
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i=1
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n=$(echo "$temp" | awk -F ',' '{print NF}') #Exclude patterns must be separated by commas
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#Read each exclude pattern and save it in the temp file
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while [[ $i -le $n ]]
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do
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var=$(echo "$temp" | cut -d"," -f$i)
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var=$(echo "$var" | tr -d \"\')
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if [[ "$var" =~ ^~/ ]]; then
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var=$(echo ${var/\~/$HOME})
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fi
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echo "$var" >> $EXCLUDE
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i=$((i+1))
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done
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;;
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#Number of old backups to keep
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keep)
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KEEP=$(echo "$line" | cut -d"=" -f2)
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;;
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#Unrecognized options
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*)
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#Skip unrecognised options
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echo "$(date): Warning: option \"$var\" not recognised. Skipping" >> $HOME/.simple_backup/warnings.log
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;;
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esac
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if [[ -f $HOME/.simple_backup/simple_backup.log.old ]]; then
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rm -f $HOME/.simple_backup/simple_backup.log.old
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fi
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done<"$CONFIG"
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if [[ -f $HOME/.simple_backup/errors.log.old ]]; then
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rm -f $HOME/.simple_backup/errors.log.old
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fi
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if [[ -f $HOME/.simple_backup/warnings.log.old ]]; then
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rm -f $HOME/.simple_backup/warnings.log.old
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fi
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rm "$INPUTS"
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rm "$EXCLUDE"
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exit 1
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fi
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BACKUP_DIR=$BACKUP_DEV/simple_backup
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DATE=$(date +%Y-%m-%d-%H:%M)
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#Create the backup subdirectory using date
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if [[ ! -d "$BACKUP_DIR" ]]; then
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mkdir -p "$BACKUP_DIR/$DATE"
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else
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#If previous backup(s) exist(s), save link to the last backup
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LAST_BACKUP=$(readlink -f "$BACKUP_DIR/last_backup")
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mkdir "$BACKUP_DIR/$DATE"
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fi
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#Set the backup directory variable to the newly created subfolder
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BACKUP_DIR="$BACKUP_DIR/$DATE"
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n_in=$(cat $INPUTS | wc -l)
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return
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}
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@ -231,6 +143,9 @@ function read_conf {
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function parse_options {
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i=1
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n_in=0
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#Create a temporary file to store inputs
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INPUTS=$(mktemp)
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#Create temp file to store exclude patterns
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EXCLUDE=$(mktemp)
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@ -254,12 +169,13 @@ function parse_options {
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mv -f $HOME/.simple_backup/warnings.log.old $HOME/.simple_backup/warnings.log
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fi
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rm $INPUTS
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rm $EXCLUDE
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exit 0
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;;
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-i | --input)
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#Create a temporary file to store inputs
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INPUTS=$(mktemp)
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while [[ "$#" -gt 1 && ! "$2" =~ ^- ]]
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do
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@ -496,9 +412,9 @@ if [[ ! -z "$INPUTS" ]]; then
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fi
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if [[ -z "$LAST_BACKUP" ]]; then
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rsync -acrv -H -X -R --exclude-from="$EXCLUDE" --files-from="$INPUTS" / "$BACKUP_DIR" >> "$HOME/.simple_backup/simple_backup.log" 2>> "$HOME/.simple_backup/errors.log"
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rsync -acrv -H -X -R --exclude-from="$EXCLUDE" --files-from="$INPUTS" / "$BACKUP_DIR" --ignore-missing-args >> "$HOME/.simple_backup/simple_backup.log" 2>> "$HOME/.simple_backup/errors.log"
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else
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rsync -acrv -H -X -R --link-dest="$LAST_BACKUP" --exclude-from="$EXCLUDE" --files-from="$INPUTS" / "$BACKUP_DIR" >> "$HOME/.simple_backup/simple_backup.log" 2>> "$HOME/.simple_backup/errors.log"
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rsync -acrv -H -X -R --link-dest="$LAST_BACKUP" --exclude-from="$EXCLUDE" --files-from="$INPUTS" / "$BACKUP_DIR" --ignore-missing-args >> "$HOME/.simple_backup/simple_backup.log" 2>> "$HOME/.simple_backup/errors.log"
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fi
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#Update the logs
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